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    <title>lev</title>
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    <center>Scilab Function</center>
    <div align="right">Last update : April 1993</div>
    <p>
      <b>lev</b> -  Yule-Walker equations (Levinson's algorithm)  </p>
    <h3>
      <font color="blue">Calling Sequence</font>
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      <dd>
        <tt>[ar,sigma2,rc]=lev(r)  </tt>
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    <h3>
      <font color="blue">Parameters</font>
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    <ul>
      <li>
        <tt>
          <b>r</b>
        </tt>: correlation coefficients</li>
      <li>
        <tt>
          <b>ar</b>
        </tt>: auto-Regressive model parameters</li>
      <li>
        <tt>
          <b>sigma2</b>
        </tt>: scale constant</li>
      <li>
        <tt>
          <b>rc</b>
        </tt>: reflection coefficients</li>
    </ul>
    <h3>
      <font color="blue">Description</font>
    </h3>
    <p>
    resolve the Yule-Walker equations</p>
    <p>
    using Levinson's algorithm.</p>
    <h3>
      <font color="blue">Author</font>
    </h3>
    <p>C. B.  </p>
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